chore(template): clean-slate template snapshot from bb4a0c7

Curated, product-agnostic snapshot of the post-story-04 tree: demo
content deleted, auth-only reference feature, web-next shell, all gates
green. Product-specific docs, ADRs 027-029, PRDs/epics/archive, editor
library traces, and product naming are curated out; generic template
repairs (coverage provider devDeps, root test:coverage script, live
lint fixes, root-only release-please) are kept. See TEMPLATE.md for
provenance, curation list, and usage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

scripts/coverage/__fixtures__/aggregate-pkg-a.lcov

@@ -0,0 +1,22 @@
+TN:
+SF:src/foo.ts
+DA:1,5
+DA:2,5
+DA:3,0
+LF:3
+LH:2
+BRF:2
+BRH:1
+FNF:1
+FNH:1
+end_of_record
+SF:src/bar.ts
+DA:1,10
+DA:2,10
+LF:2
+LH:2
+BRF:0
+BRH:0
+FNF:1
+FNH:1
+end_of_record